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Real Estate Fund Investments - Schedule of Realized and Unrealized Gains from Real Estate Fund Investment (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Investment Holdings [Line Items]    
Realized and unrealized gains, net $ 873pgre_RealizedAndUnrealizedGainsNet  
Predecessor [Member]    
Investment Holdings [Line Items]    
Realized and unrealized gains, net   46,167pgre_RealizedAndUnrealizedGainsNet
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Unrealized Gain on Real Estate Fund Investments [Member] | Predecessor [Member]    
Investment Holdings [Line Items]    
Realized and unrealized gains, net   $ 46,167pgre_RealizedAndUnrealizedGainsNet
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